Slag-furnace



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0. B. PECK. SLAG PURNAGB. No. 379,412. Patented Mar. 13, 1888.

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lO. B. PECK.A

SLAG PURNAGE.

No. 379,412. Patented Mar. 18,1888.

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UNITED STATES PATENT EEicE.

ORRIN B. PECK, OF CHICAGO, ILLINOIS.

SLAG-FURNACE.

SPECIFICATION forming part of Letters Patent No. 379,412, dated March 13, 1888.

Application tiled November 25, 1887. Serial No. Q56.159.

To @ZZ whom it may concern.-

Beit known that I, ORRIN B. PEcK, a citizen of the United States, residing at Chicago, Illinois, have invented certain new and useful Improvements in Slag-Furnaces, of which the following is a specification.

The object of my invention is to make a furnace in which the molten or heated slag or other heated refuse from smeltingfurnaces can beutilized in generating steam; and my invention consists in the features and details of construction hereinafter described and claimed.

Figure l is a sectional elevation of my furnace and steamrboiler, taken through the line m a: of Fig. 2, looking in the direction of the arrows. Fig. 2 is a plan View of the slag-furnace, taken in the line y y of Fig. l, looking in the direction of the arrows. Fig. 3 is a plan view of the boiler shown in Fig. l with the cover removed. Fig. 4 is a plan View with the cover in place. Fig. 5 is a side elevation of a portion ofthe furnace and removing and elevating carriers, taken in the line z z of Fig. 2. looking in the direction ofthe arrows; and Fig. 6 is an enlarged view of a portion of Fig. 5, taken in the line w w, looking in the direc tion of the arrow.

In the drawings, A represents the walls ofV iny slag-furnace; B, the floor or table on which the slag is deposited in the furnace; C, a blastpipe leading from a force blower or fan around and above the door or table; D, a spout for depositing the molten slag upon the door or table; E, a carrier for removing the slag when cooled; F, a carrier for elevating the discharged slag and depositing it in a car or other conveyance to remove it away; G, a roller or mop :for coating the surface of the floor or table with mud or other protecting substance; g, a spout 'for supplying the mud; H, the heads ofthe tubular boiler, arranged above the slag floor or table; I, the water-tubes to contain the water to be converted in fo steam; J', a pipe for conveying the steam to the steam-cylinder or other place of use; K, a pipe for carrying the air and heat from the boiler around into the blower or fan to be again discharged into the slag-furnace through the pipe C; L, a shaft for rotating the lloor or table, and S a shaft for rotating the mud-drum and the removing and elevating carriers.

As above said, the object of my invention (No model.)

is the utilization of molten or'hot slag from smelting and other furnaces for the production of steam. As is well known, this slag when discharged in a hot ormolten condition from smelting-furnaces contains a great quantity of heat, which has heretofore been wasted for the lack of proper means to apply it to the production of steam or other useful purposes.

In constructing my slag-furnace,7 as I term it, for utilizing the heat of hot or molten slag in the production of steam, I make a slag holding or carrying table or floor, B, of castiron or other suitable material and preferably of circular form, as shown in Fig. 2 of the drawings.V This table or door is provided on its under side with a rack of series of teeth, b, as shown in Figs. l and 5. These teeth are arranged in a circle around the under side' of the floor or table. A shaft, L, rotated by any convenient motive power, carries a gear-wheel,

EZ, whose teeth mesh into the teeth b on the under side of the floor or table and cause it to rotate.

Of course it will be understood that the floor or table, is properly supported on a centerpost and rollers moving upon a proper track to preserve the proper position of the table and enable it to be rotated round and round. These rollers, center posts, tracks, &c., are clearly shown in Fig. 1, and as by themselves they do not differ materially from the means employed for supporting and rotating a table they do not need to be more Ininutely described.

The door or table B is located within'the circular walls of the furnace A, which surround and inclose it. These walls are preferably provided with a space between them to be filled with water to prevent their being overheated and injured by the heat of the molten slag. They need extend above the floor or top of the table no farther than necessary to enable the slag to be discharged on the floor and removed again with facility. Probably twelve or fifteen inches will be found, in ordinary cases, sufficient l'or this purpose.

Leading through the walls of the slagfurnace I arrange a spout or pipe, D, (shown in Fig. 2,) through which the slag Vfrom the smelting-furnace may be carried and discharged on the door. This spout may be ar- IOO ranged either to carry the slag directly from the smeltingfurnace or from a receiver or other receptacle into which it maybe discharged from the smclting-furnace, as may best suit the convenience of the operator in connection with the location and arrangement of his smeltiug-furnaces. A blast-pipe, C, enters the walls of the slag-furnace preferably above the floor or table and around its circum ference, as shown in Fig. 2, though a straight pipe entering the l'urnaceto discharge a current of air upon the slag while on the table may be used, if preferred. This blastpipe may be turned so as to approach and surround the center piece of the table. as shown in that figure, if desired; but in this case that portion of the blast-pipe which crosses the floor or table to surround the center post should be raised enough above the door to permit the slag to pass beneath it as the floor is rotated. This blast-pipe, it will be understood, is connected with a fan or blower, (shown in Figs. l and 2,) by which a blast or current of air may be forced into it, and it is provided with numerous perforations to permit the air when thus driven into it to pass out or onto the Hoor or tab1e,as indicated by the arrows in Fig. 2. This blast or current of air coming in contact with the hot molten slag will cause it to give up or radiate its heat more rapidly, so that after it has been rotated around once on the table or iioor to the place of discharge it will have probably accomplished its purpose and be ready for removal.

To remove the slag from the iioor or table after it has wholly or partially given forth or imparted its heat, I provide a carrier, E, which consists of a series of Scrapers arranged on an endless chain or in any other couvenientway, which passes through the walls of the slagfurnace, and which is rotated ou two drums or shafts, d d', supported in aframe, j', riveted or otherwise fastened to the walls of the slagfurnace and extending out toward the middle of the same, as shown in Figs. 2 and 5. As this removing-carrier rotates, it will scrapethe slag from the iloor or table as it is delivered to it by the rotation of the table. The slag thus removed from the floor or table'can be dropped into a receptacle, R, in which an elevating carrier, F, may be arranged, as shown in Fig. 5, whence it may be carried and discharged in a car to admit of its being removed or taken away. In Fig. 2 I have shown a shaft, S,which,througli a gear-wheel, revolves the shaft s to operate this elevating-carrier, and through a sprocket-chain, s', to rotate the shaft d, which operates the removing carrier E. The rotation ot" this shaft d rotates another shaft, and with it the drum or mop G. (Shown in Fig. 2.) This drum or mop G is fastened to a frame, g', bolted or otherwise fastened to the inside wall of the slag-furnace, as shown in Fig. 2. lt is located close to the removing-carrier E and beyond it in the direction of the rotation of the table, so that the table passes under it immediately after passing coating to protect it from the intense heat of the hot molten slag and to prevent the slag from adhering thereto.

Around the removing-carrier E and the mud drum or mop G may he arranged a case, T, to cover and protect them, with an opening or space at one side under it (marked t) to admit the slag as the table rotates. so that it can come within the reach and operation of the removing-carrier E. As the removing and elevating carriers, the mud-drum, and the means for rotating them are clearly shown in Figs. 2 and 5, and as the novelty of my invention does not consist in the particular means employed for rotating these carriers and drum,they need not be further described in detail.

Above'the walls surrounding the slag-table, and resting upon them, if desired, I arrange a tubular boiler with hollow heads H and water-tubes I running back and forth between these heads. By reference to Fig. 2 it will be seen that these tubes are arranged in a series or coil, so to speak, so that water in them may circulate back and forth through them and the heads H. These tubes are provided with spaces between them, as shown in Figs. l and 3, so that the heat thrown off by the molten slag on the floor or table passesup freely between them, as shown by the arrows in Fig. l. The arrangement of these tubes and heads may be in the ordinary way on which tubular boilf ers are constructed. instead of tubes, a shell-boiler with its tubes extending up vertically through it may be employed. The boiler is preferably covered or inclosed, and in Fig. l this inclosing wall or cover is indicated by the dark line A. At the top of the tubes may be located a pipe, J, to carry the live steam as generated to the cylinder or case where it is to be used, as in ordinary boilers. From the top of the inclosure or cover apipe, K, preferably provided with branches, as shown in Fig. 4, leads back to the fan or force-blower, so that the heated air passing up through the tubes of the boiler may be drawn off and carried down through the fan or blower and again driven into the slag-furnace into contact with the molten slag. A pipe, K', connecting with the pipe K, is, however, provided, and a valve, lc, arranged therein, so that this heated air can be shut oft from the fan or blower and discharged, if desired.

In Fig. 2 I have shown a tire box or chamber, FQ which may be located outside the slagfurnace, with an opening communicating into the same, so that if there should be an insufficient quantity of hot or molten slag at any time au auxiliary fire may be obtained to re- IOO If preferred, however,

IIO

enforce or assist the operation of the slag-fur- :nace in producing the necessary heat for the generation of steam.

By slag I mean not only what is technically known bythat designation,butany heated material or refuse that is allowed to cool without its heat being utilized about smeltingfurnaces, factories, Sac.

'What I regard as new, and desire to secure by Letters Patent, is-

1. In a slag-furnace, the combination of a steam-generating boiler, a slag-holding table adapted to rotate horizontally, and means for rotating the same, substantially as described.

2. In a slag-furnace, the combination of a steam-generating boiler, a slag-holding table underneath the same, and a slagremoving device whdl'eby the table is cleared of the slag after imparting its heat, substantially as described.

3. In a slagfurnace, the combination of a slag-holding table, a pipe or spout discharging a Wash thereon, anda mop or roller forspreading the same over the surface of the table, whereby the slag is prevented from injuring the table or adhering thereto, substantially as described.

4. In a slag-furnace, the combination of a slag-holding table, a slag-removing device, a Wash-spreading mop or roller, and a boxing inclosing the carrier and mop, substantially as described.

5. In a slag-furnace, the combination, with a steam-generating boiler, of a slagholding table and an air-blast pipe discharging a blast or current of air upon the slag While on the table, substantially as described.

6. The combination, in a slag-furnace, ofa steam -boiler and slag-holding table and an auxiliary lire chamber or box to reenforce and assist the heat of the slag, substantially as described.

ORRIN B. PECK.

-Witnessesz THOMAS A. BANNING, GEoRGE S. PAYsoN. 

